Actuating signals on and communicating with trains



H.A.THOMPSON. ACTUAHNG SIGNALS 0N AND COMMUNICATING WITH TRAINS. I

' APPLICATION- }HLED AUG. 23.1916.

g g y m Patentd Jan. 6,1920.

' a SHEETS-SHEET 1.

H. A. THOMPSON. ACTUATING SIGNALS ON AND COMMUNICATING WITH TRAINS.

APPLICATION FILED AUG.23, 191a 1,327,411 1, Patented Jan, 6, 1920.

a SHEETSSHEET 2.

H. A. THOMPSON. ACTUATING SIGNALS ON AND COMMUNICAUNG WITH TRAINS. APPLICATION FILED AUG.23, 1316.

1,327,411 Patented Jan. 6, 1920 a SHEET SSHEET 3.

v controlling ,magnet.

HENRY ARTI IUR THOMPSON, OF MANCHESTER, ENGLAND.

ACTUA'IING SIGNALS ON AND COMMUNICATING WITH TRAINS. 1 .32 231i i Specification of Letters n Patented Jan. 6, 1922 0.

Application filed August 23. 1916. Serial No. 116,427. v l

1 concern that -l. llnxm' An'rnru ect of the King of Great residing at .35 l)e'rl v HSttl'. in the county have invented new '1' H u'lmm if mu tie it known 'lnonrsox. a suhj liritain and Ireland. road. l\'illiington. .\lancl of Lam-aster. England. and useful liiiprovements in Artuating Signals on and (omnumicating with 'lra'ins. oi

which the following is a specification.

My invention relates to railwayinductive signaling and control and consists in improvoments in or modilications oi' the inyentimi particularly described and ascertained in iu v prior latent No. 1.227.021 dated May 32nd. W17. ln said. specification is set torth a method whereby signaling to or the control of trains may luel'lected inductively by the combined action oi a sensitive polarized telegraph relay. a reed relay or tuned relaying sounder. and a valve- ..iecording to the present invention it is proposed to conline the signaling and control to localities within the danger or naling zone.

For this purpose means are provided for transferring the control of the valve-controlling magnet trom the reed rela) toa tuned relaying sounder. An illustration thereof is found in Figure. 1 of the accompanying drawings. An altcrnatii 'c method shown in Fig. :2. is to subdue the audibleclear signal outside the signaling zone. Fig. 3 is illustrative of the. wayside control.

in Fig. 1 X represents the sensitive polechanging relay operated by the teeblc induced currents, R the reed relay, hereina't'tor referred to as the silentrelay, R the relaying sounder, M the solenoid onvalve controlling magnet, and an automatic switch or cut-out device. When the train is outside the signalling zone a. current is induced in the train coil A-hy virtue of the latters proximity to the pulsating magnetic field permanently maintained around the track conductor L, Fig. 3, which is fed with current.- at say 50 cycles from the generator by Way of the mains Q, the current being stepped down by a suitable resistance L, reed R vibrates. and the plunger 1? is re tained Within the solenoid coil, the danger indications thus being Withheld. The coils of relay R are so connected to the terminals ot the pole-changing relay X and the divided batter that a current flows from battery terminal .1, via spring contact 2, automatic eee 3, spring contact et rcterminal (5, pole-changcontact screw 8, tojbatbattery terniinal switch contact pi in terminal relay .ing circuit t'lhaQll T, tery terminal J; or from 10. via contact screw 11. circuit closer/7, 1'e la v terminal (3. relay terminalo, spring con tact 4. contact-piece and spring contact '2 to battery terminal 1. Thus when said circuit closer is oscillating to the alternations ol the induced current reedli vibrates and makes virtuallycontinuous contact with flanking springs 12. 13, so that a current circulates from battery terminal .10, through switch"terminals H and 15 solenoid terminals 16 and 17, flanking springs 12', 13. and reed R to battery terminal F); with the result that the plunger P is retained within the solenoid coil.

l pon the arrival of the train at a'per'inanent break Y, Fig. 3. in the track magneticfield situated at the entrance to the signaling zone Z, reed R will come to rest, the induced current in the train coil A being intermitted. The solenoid circuit being thereby broken the spindle 18 attached to switch armature 19 falls, and the connection normally maintained through contact springs. 2. 4. and switch contact-piece 3 (carried on the upper end of said spindle) is severed and the continuity of the circuit containing the silent relay R is interrupted, so that said relay can no longer control the solenoid. The further effect produced by thetall ot' the switch armature 19 (which is now out of range of the attractive forcefitis th joining up of the circuit containing the. relaying sounder R switch contact 3 resting upon spring contacts 20, 21. A current now flows from battery terminal 10 Via contact screwll, circuit closer 7, spring contact 2t, switch contact 3, spring contact 20, and relay tcrn' inals 22, 23, tohattery terminal 1', or from battery terminal. 1 Via relay terminals 2'2, spring contact 26, contact 3. spring contact 21, circuit closer 7, and contact screw 8 to battery terminal 9. he control of the solenoid now being transferred to the relaying sounder a current circulates from batteryterminal 10, through switch terminals l t, 15',- solenoid terminals 16, 17, flanking springs 24:, 25,; and reed .R to battery terminal 9. The danger indications are still restrained and an audible clear signal announces a clear road the danger, zone, it being semaphore S controlling the line wire W thrown in) assumed that t e of sound.

i one such extension will 4 order that the reed .tion it is proposed to dam control system,

a polarized pole-changing relay is in the proceed position. The note will cease upon the armature 19 being replaced by the, driver. separated from the rails by a sullicient space so that no effective neutralizing.current will be imluocd in an; latter.

Provided that the rate 01" vibration is suf lic iently high it is not essential for the pro-v duction of a musical note that the sounding attachments should be of resonant material. The object to be attained by the use of such material is simply an increase in the volume According to another method of attaining the result'aimed at in this inventions or said attachments during the period in which the train is outside the danger This result is obtained by attaching a pad 26 (Fig. as rubber, to the cross-piece 27 fixed to the armaturecarried spindle 28 of the electro magnet D, said pad normally pressing against-the gengs solenoidcircuit prevents the armature 30 of said electro-magnet from falling. When the train reaches the permanently inactiveportion of theitrack magnetic field the solenoidcircuit will be momentarily broken and the coils 31, 32 being contained therein the armature 30 will he released and the volume. of sound greatly augmented. When the audible clear signal is no longer required the armature, now out of magnetic control, will be replaced. by the driver.

Since .it is not-essential in my invention that the reed appertaining tothe polarized reed rcley'or to the relaying sounder should yibrate between polar extensions liaving the same sign of polarity, the coils-of such in struments may be mounted on'extensions of dissimilarlpoles. The reversing current will passithroug'h the coils, in such direction and with such force that at a given moment only be capable of attracting the armature. It is still essential,

however, that the attractive force shall be.

applied nearthe fixed-end of the reed in may becapable of respending sufiiciently to a frequency somewhat higher thaniit-s own, and also that the torsional eflectgshall still be at a maximum near thcixed end 'of the reed in order to reventnodular or other undesired vibra tion. f v

I declare that what 1 claim is- In: a railway inductive signaling" 01" I a reed relay on the train a, source ct energy on-the tram, connections between the reed relay and the train source, on the train,

wayside means. including; a Wayside source The line wires L and 1V are p the reverbera- 2) of suitable material, such 7 29 when the current in the of energy for actuating the polarized polechanging relay and thereby controlling the vibration of the reed relay by means 01 current from the train source, a Valve control- .ling magnet, an automatic switch, connections between the automatic switch, the reed relay and the magnet whereby during vibration of the reed relay under control of said wayside means the automatic switch c0mpletcs a circuit so that current impulses from the train source are sent through the valve controlling magnet to restrain the control valve release, the automatic switch being adapted to open the circuit last-mentioned when the reed relay ceases to vibrate under the any side control, a relay sounder on the train, and connections between the relay sounder, the train sburce and the automatic switch whereby when the automatic switch opens the circuit through the reed relay the'circuitthrough the relay sounder is closed. I

2. In a railway inductive signaling or control system, a normally inoperative valve-operating magnet, a tuned reed relay adapted to send current impulses through the .valve-operating 1.. gnet, an automatic switch controlled by said reed relay, and a tuned sounder brought into action when said automatic switch is no longer under control.

3. In a railway inductive signaling,- or control system, a'polarized pole-changing telegraph relay adapted to respond to induced alternating currents, alocal circuit, a

. polarized reed relay controlled by said telegraph relay and sending current impulses through the local circuit, an automatic switch armature. controlled by'said current impulses, a tuned polarized relaying sounder brought into action upon the fall of said armature, and a valve controlling solenoid receivin g current impulses from said reed relay or relaying sounder.

4, In a railway inductive signaling or control system, a tuned reed relay, means for vibrating the reed thereof, a tuned relay- ,ing sounder, train carried means for breaking thecircuit throng said rec-d relay and automatically making the circuit through 7 and circuits controlled by said relay o'r sounder for holding the solenoid plunger.

In testimony name to this specificatlon in the presence of two subscribing witnesses.

, HENRY ARTHUR THOMPSON.

Witnessesz I JOSHUA En'rwzsnn, ALFREDSTUART YA rns.

whereof I have signed my 

